Twin vertical-axis wind turbine with automatic wind tracking



FIG. 1 is a perspective view of a twin vertical-axis wind turbine with automatic wind tracking according to the invention;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a back elevational view thereof;

FIG. 4 is a left-side elevational view thereof;

FIG. 5 is a right-side elevational view thereof;

FIG. 6 is a sectional view thereof, taken along lines 6-6 as indicated in FIG. 5;

FIG. 7 is a top view thereof;

FIG. 8 is a bottom view thereof;

FIG. 9 is a perspective view of a second embodiment of a twin vertical-axis wind turbine with automatic wind tracking according to the invention;

FIG. 10 is a front elevational view thereof;

FIG. 11 is a back elevational view thereof;

FIG. 12 is a left-side elevational view thereof;

FIG. 13 is a right-side elevational view thereof;

FIG. 14 is a sectional view thereof, taken along lines 14-14 as indicated in FIG. 13;

FIG. 15 is a top view thereof; and,

FIG. 16 is a bottom view thereof. 

CLAIM The ornamental design for a twin vertical-axis wind turbine with automatic wind tracking, as shown and described. 